Neglecting the density of air ,the terminal velocity obtained by a raindrop of radius 0.3 mm falling through air of viscosity 1.8xx10^(-5)Nsm^(-2) will be ….

Neglecting the density of air ,the terminal velocity obtained by a rai

1.	Neglecting the density of air ,the terminal velocity obtained by a raindrop of radius 0.3 mm falling through air of viscosity 1.8xx10^(-5)Nsm^(-2) will be ….
Answer» `10.9ms^(-1)` `7.48ms^(-1)` `3.7ms^(-1)` `12.8ms^(-1)` SOLUTION :`r=0.3mm=3xx10^(-4)m` `eta=1.8xx10^(-5)Nms^(-2)` Terminal velocity `v_(t)=(?)` `v_(t)=(2)/(9)(r^(2)g(rho-rho_(o)))/(eta)` `rho` = DENSITY of water `=10^(3)kg//m^(3)` `rho_(o)`=neglecting air density `v_(t)=(2)/(9)((9xx10^(-8))(9.8)(10^(3)))/(1.8xx10^(-5))` `=10.88` `v_(t)=10.9m//s`